Supertech Subaru WRX/STi 16V Dual Valve Spring Kit

The spring seat pressure on this Supertech dual valve spring kit is set at 100 lbs at 1.45 inches installed height. This is a critical measurement because it dictates how well the valve train stays in sync, especially when you're pushing your engine harder. For Subaru WRX and STi owners who are looking to upgrade their engine's performance, particularly for higher RPM operation or forced induction setups, a robust valve spring kit like this one is essential. It helps prevent valve float, which is when the valves don't close properly at high engine speeds, leading to a loss of power and potential engine damage.

This kit uses a dual spring design, meaning there are two springs working together for each valve. This setup offers improved stability and control over the valve's movement compared to single springs. The springs are made from a high-strength spring steel, chosen for its ability to withstand the intense heat and pressure inside the combustion chamber while maintaining its tension over time. Supertech is known for producing well-built engine components, and this valve spring kit is no exception. They are designed to handle the demands of modified engines, ensuring reliable performance when you need it most.

When installing this kit, you'll want to ensure you have the proper tools for valve spring compression and replacement, as it involves working inside the cylinder head. It's a job that requires precision and care to get right. This kit is designed to work with the factory valve sizes, making it a direct replacement for your stock springs, but it's always a good idea to double-check compatibility with any other engine modifications you might have. This kit includes the springs themselves, and you'll typically reuse your stock retainers and valve locks, though it's wise to inspect those components for wear during the installation.